Fatigue performance of friction stir welded marine grade steel

Helena Polezhayeva, Athanasios Toumpis, Alexander Galloway, Lars Molter, Bilal Ahmad, Michael E. Fitzpatrick

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)
122 Downloads (Pure)


An extensive study on the fatigue performance of friction stir welded DH36 steel was carried out. The main focus of this experimental testing programme was fatigue testing accompanied by tensile tests, geometry measurements, hardness and residual stress measurements, and fracture surface examination. The S-N curve for friction stir butt welded joints was generated and compared with the International Institute of Welding recommendations for conventional fusion butt welds. Friction stir welds of marine grade steel exceeded the relevant rules for fusion welding. This newly developed S-N curve is being proposed for use in the relevant fatigue assessment guidelines for friction stir welding of low alloy steel. Fracture surfaces were examined to investigate the fatigue failure mechanism, which was found to be affected by the processing features generated by the friction stir welding tool.
Original languageEnglish
Pages (from-to)162-170
Number of pages9
JournalInternational Journal of Fatigue
Early online date13 Aug 2015
Publication statusPublished - Dec 2015


  • friction stir welding
  • low alloy steel
  • fatigue testing
  • residual stresses
  • fracture surface analysis


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